Striping attachment for knitting machines



Jan. 25 1927. 1,615,807

J. BOSCH sTRI PING ATTACHMENT FOR KNITTING MACHINES Filed July 1923 2 Sheets-Sheet 1 o o 8 o O I l V %9\ r 5 v F: n H I I Q o o Snow Mom 4/055 505m Jan. 25,1927. N 1,615,807

, J. BOSCH S'TRIPING ATTACHMENT FOR KNITTING MACHINES Filed July 12, 1923 2 Sheets-Sheet 2 glvx-venfbz 347035 Bast/1 Sign? M attorney s Patented Jan. 25, 1921.

UNITED STATES 1,615,807 PATENT OFFICE.

JOsE BOSCH, or BARCELONA, SPAIN, ASSIGNOR 'ro sco'rr AND WILLIAMS, Inc, OF

NEW YORK, N. Y., A CORPORATION OF MASSACHUSETTS.

STRIPING ATTACHMENT FOR KNITTING MACHINES. I

Application filed July 12, 1923, Serial No. 651,094, and in Spain October 14, 1922.

Fig. 2 is a front elevation of suflicient of the head of the machine to Show how my mechanism is attached;

Fig. 3 is the same as Fig. 2 with my bobbin stand swung into operative position; and Fig. 4 is aplan view of the mechanism controlling the swin ing of the bobbin stand. In fabric made y my attachment sup-' plementary yarnsof the desired color or colors are wrapped around the needles which are to knit the stri e or stripes and these striping yarns are 't in with the ordinary yarn, the striping yarns being knit on the outside of the fabric so that the-stripe will show.

Referring now to the drawings, the machine has abedplate 1, a revolving cylinder of needles 2 and a latch ring 3 as usual. Projecting upward from the latch ring 3 are columns 4 and 5 which unite in a -jaw 8. A bobbin stand 7 is suspended from this jaw 8 by means of a sleeve bearingG pivotally swung in the jaw 8 by two short pins 9, a shaft 10 inside the sleeve bearing 6 carrying the bobbin stand 7. bearing 6 is from front to rear of the machine so that the bobbin can swing to the right of perpendicular (see Fig. 3). By means of the bevel gear 1.2 'on the shaft 10 and the gear 13, fdriving gears 14, 15 and the shaft 16 the bobbin stand can be rotated at a constant speed whether perpens dieular or swung to the right. It should be noted that the bevel gear 12 is located close to the pivot-pins 9 and that-the slight" relative movement of the bevel gears 12, 13 due to the tilting of, the bobbin carrier is accomplished withoutdisengaging the gears by cutting the teeth of gears slightly deeper and lmviug them engage more deeply. The shaft 16 can be driven from the main shaft The sleeve (not shown) in the manner shown in the Scott Patent 1,282,958, but in any case the needles 2 and the bobbin stand 7 should i make the same minute.

The bobbin stand 7 carries a number of vertical bobbins 17 each adapted to hold the supplementarv yarn for a vertical stripe. In the drawings I have shown yarn arms 18 and yarn guides 19, the latter being designed to offer the yarn to the'needles. These yarn guides 19 are arranged on the lower part of the bobbin stand on a circle of smaller diameter than that of the cylinder needles 2 and when perpendicular are at a height about Opposite the top of the needleswhen raised to receive the yarn.

In making stockings it is not desirable to have stripes on the sole or heel of the foot and on some other parts. The mechanism which I shall now describe makes it possible to knit stripes on only one side or number of revolutions per part of the tube, on all sides of the tube, or

to stop making stripes entirely for any number of courses. The bobbin stand shaft 10 extends above the bevel gear 12 and has on its upper end a concentric disk 22 and an cccontrically mounted disk 23. Beside these two disks is a slide 27 horizontally movable in a guide 28 and controlled by a rod 29, and a bell crank lever .30, and a rod 31 connected thereto. (Fig. 1.) On the lower end of the rod 31 is a roller 32 adapted to move over the surface of cam 33 on the main pattern drum 34 and thus more the slide 27. There are tension springs 35 and 36 fastened between the slide 27 and the guide 28, and the guide 28 and the shaft 10.

On the slide 27 facing the disks 22 and 23 'are short cam-S 24, 25 and 26, cams 24 and 26 being on a-horizontal line with-the conparent from an examination of the positions of the three short cams 24, 25, and 26 (Fig.

1) that the drum cam 33 can move the slide 27 andbring any one of the three short cams opposite the disks 22 and 23. As seen in Fig. 1 the main pattern drum revolves clockwise and the cam 33 is a two step cam.

The cam 26 is low (Fig. 4) and when this cam is in engagement with disk 22 the bobbin stand is perpendicular (Fig. 2). When cam 25 is pushed into engagement with the eccentric 23 the bobbin stand is swung to lltl the right and revolution of the shaft 10 causes the striping yarn guides to oscillate between a position in which the guide nearest the needle circle is a short distance inside the latter, to operative position, when the circle of striping yarn guides just overlaps the needle circle as shown in Fig. 3. However, when the short cam 24 is in engagement with the concentric disk 22 the bobbin stand is held steadily in operative position so that the yarn guide circle just overlaps the needle circle.

For the purposes of illustration, I will now describe the operation of my attachment when making a striped stocking.

When the welt of the stocking is being knit if no vertical stripes are desired the roller 32 mounted on the rod 31 rests on the highsurface of the drum cam 33, the short cam 26 is in contact with the concentric disk 22 and the bobbin stand and striping yarn guides hang perpendicularly as shown in .Figures 1 and 2.

When about to begin knitting the striped 7 leg portion the roller 32 rides down oii the high part of the cam to a low or intermediate position, which causes the slide 27 to bring the cam 25 opposite the eccentric disc 23. This movement is so timed that the low side of the eccentric disc 23 is opposite the cam 25. The needle cylinder 2 and the bobbin stand shaft 10 now make half a revolution and the eccentric disc tips till the yarn guide circle just overlaps the needle circle. At this moment the main pattern drum is racked again, the roller 32 drops down onto the surface of'the drum and the slide rests on the surface of the main pattern drum 34 and the slide 27 is pulled forward under the influence of the spring 35 till the short cam 24 engages the concentric disk 22. This holds the bobbin stand and striping yarn guides to the right till the yarn guide circle just overlaps the needle circle. As the yarn guides revolve they are adjusted to cross the circle of needles just ahead of the corresponding striping needles. The striping yarn comes from inside the needle circle and lies across the path of the raised needle or needles which is moving faster than the striping yarn guide because it is moving in a larger circle. The needle or needles therefore as the yarn guide, the yarn guide crosses ack inside the needle circle as the two circles revolve and the thread is thus wrapped around the needle. Each group 'of needles which is to make a stripe has its corresponding bobbin and yarn guide arid is fed as described.

It will be notedthat eachstriping yarn is held on the inside of the needle circle "at the sinker after the striping has once commenced, thus insuring accurate'floating of the yarn around the needle.

At the heel of the stocking it is of course desirable to stop the stripes on the heel side of the stocking but to continue them down the-instep. This is done by the roller 32 riding up the front face of cam 33 to an intermediate position, thus withdrawing the slide 27 till the short cam 25 is in contact with the eccentric disk 23. As the shaft 10 revolves, this eccentric disk bearing against the short cam will cause the bobbin stand and yarn guides to oscillate between the position in which the guide nearest the needle circle is a short distance inside the latter and the position in which the striping yarn guide circle just overlaps the needle circle-as in the case of short cam 24 engaging the concentricdisk 22. Since the yarn guides can wrap the striping yarns around the needles only when the yarn guide and needle circles overlap as described, it will be apparent that according to the shape of the eccentric disk 23 some or many of the striping yarns will not be knit into the stocking. The movements just described preferably take place for a' few courses just making the heel. When actually going into the heel the roller 32 rides up onto the high part of the cam-- preferably durin the time that the spindle 10 is in a central position. In changing to the foot the roller goes onto the intermediate suriace of the cam, the cam 25 is in contact with the eccentric disc 23 and the spindle feeds yarn around the isolated needles on the instep. When it is time to make the toe, the cam 33 on the pattern drum aetuates the rod 31. the bell crank lever 30 and the slide 27 to bring the cam 26 opposite the disk 22. At the same instant the spring 36 pulls the shaft 10 intoperpendicular position where all the yarn guides are inoperative.

What I claim is 1. In a circular knitting machine having a revolving needle cylinder. a revoluble bobbin stand. within said cylinder and yarn guides on said bobbin stand, revolving with lesser linear velocity than the needles in com-' bination with means adapted to move said yarn guides into and out of operative relation with the needles by moving the axis of tlllie bobbin stand toward and from the neees.

2. Ina circular knitting machine having a revolving needle cylinder, a bobbin stand in association therewith, turning on an axis eccentricallylocated withres ect to the axis of the needle cylinder but su stantially parallel therewith, in combination with yarnv guides mounted thereon revolving with lesser linear velocity than the needles and adapted to carry yarnsoutward and around the needies by moving the axis of the bobbin stand, substantially as described.

3. In a circular knitting machine having a revolving needle cylinder, a revolving bobbin stand concentric with said needle cylinder, bobbins and corresponding yarn guides on vsaid stand, in combination with means adapted to swing said bobbin stand from the concentric position in which the yarn guides can not feed yarn to the needles, to a position in which the yarn guides and needle cylinder are in operative association.

4:- In a striping attachment for a circular 'knitting machine having a revolving needle cylinder, revolving yarn guides arranged in a circle of smaller diameter than the circle of cylinder needles, said yarn guides being adapted to be swung as a unit till their circle overlaps the needle circle and then feed yarn l to the needles substantially as described.

around the needles, substantially as described.

In a circular knitting machine having a revolving. needle cylinder, a revolving bobbin stand, bobbins and corresponding yarn guides on said bobbin stand, in combination with a shaft for said bobbin stand, concentrio and eccentric disks on said shaft, a horizontal slide, and cams on said slide adapted to bear against said disks and swing said.

bobbin stand substantially as described.

7 In a circular knitting machine having a revolving needle cylinder and a pattern drum, a revolving bobbin stand within said cylinder, bobbins and corresponding yarn guides on said bobbin stand revolving with lesser linear velocity than the needles, a shaft for said bobbin stand, a horizontal slide and means associated with said shaft and slide to swing said bobbin stand, in combination with means controlled by the main pattern drum adapted to control the swinging of said bobbin stand.

In testimony whereofI have signed my name -to this specification,

J OSE BOSCH. 

